CN101147939B - Method for changing force control gain and die cushion control apparatus - Google Patents
Method for changing force control gain and die cushion control apparatus Download PDFInfo
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- CN101147939B CN101147939B CN2007101534576A CN200710153457A CN101147939B CN 101147939 B CN101147939 B CN 101147939B CN 2007101534576 A CN2007101534576 A CN 2007101534576A CN 200710153457 A CN200710153457 A CN 200710153457A CN 101147939 B CN101147939 B CN 101147939B
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- die cushion
- power
- force control
- control gain
- slide block
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/02—Die-cushions
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
- G05B19/21—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using an incremental digital measuring device
- G05B19/23—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using an incremental digital measuring device for point-to-point control
- G05B19/231—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using an incremental digital measuring device for point-to-point control the positional error is used to control continuously the servomotor according to its magnitude
- G05B19/237—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path using an incremental digital measuring device for point-to-point control the positional error is used to control continuously the servomotor according to its magnitude with a combination of feedback covered by G05B19/232 - G05B19/235
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/41—Servomotor, servo controller till figures
- G05B2219/41251—Servo with spring, resilient, elastic element, twist
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45143—Press-brake, bending machine
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A method for changing a force control gain expressed as a ratio of force error (e) to velocity command value in a control circuit performing a force control of a servo motor (14) driving a die cushion (13) disposed opposite to a slide (12) in a press machine (11). The method includes: obtaining a difference (M) between a displacement of the slide (12) and a displacement of the die cushion (13) in a state in which the slide (12) and the die cushion (13) collide with and are exerting force (F) on each other; detecting the force (F) when the difference (M) of the displacements is obtained; calculating a spring constant (K) of a structural portion based on a proportionality between the difference (M) of the displacements and the force (F), when regarding the structural portion including the slide (12) and the die cushion (13) as an elastic structure; and changing the force control gain based on the spring constant (K) using a fixed proportionality that exists between the force control gain and a reciprocal of the spring constant (K).
Description
Technical field
The present invention relates to a kind of method for changing force control gain and apparatus for controlling die cushion, its power that produces for the interaction that makes the die cushion that disposes in opposite directions owing to the slide block of press with this slide block becomes the value of regulation, in the control circuit that described die cushion is carried out power control by servomotor, be used to change the force control gain of representing as the power deviation and the ratio of speed value.
Background technology
Generally, in order to make the power that produces between slide block and the die cushion become the value of regulation, in the die cushion control method of die cushion being carried out power control by servomotor, the power deviation be multiply by force control gain obtain speed command, carry out the driving control of servomotor according to this speed command of obtaining.The power deviation is power detected value poor of predefined power command value and the reality that produces between slide block and die cushion.
Force control gain was obtained before making actual stamping machine action, used the gain of obtaining that servomotor is carried out power control in punching course, carried out punch process.When the force control gain of obtaining was not suitable value, it was big to produce vibration or overshoot quantitative change, and control system becomes unstable sometimes.Under the excessive situation of force control gain, also can cause machinery or adjunct to damage.Therefore, in not surmounting a certain amount of scope, overshoot do not obtained the force control gain obtained as higher limit.
An example as the method for obtaining force control gain has following method: apply certain power on the direction of principal axis that carries out power control, improve gain gradually from enough low gain on one side and detect the overshoot relative on one side, obtain the higher limit of force control gain with the power command value.The force control gain of obtaining by such method since machinery over time, the material of machined material changes and the individual difference of machinery etc., its optimal value changes, so should change as required.
In addition, though directly do not concern,, open the content that discloses in the flat 10-202327 communique according to control die cushion at the torque instruction of servomotor the spy as the content of expression correlation technique with the present invention.In addition, open in the 2006-130524 communique, control die cushion, disclose detection speed erection rate instruction, the content of carrying out power control with slide block according to speed command at servomotor the spy.
, owing to force control gain is affected in operating environment (inertia, quality, rigidity etc.) easily, must skilled problem so exist in order to obtain correct value.In addition, when the force control gain of She Dinging is lower value in the early stage, have following problem: when improving gain in the scope of the higher limit that is being no more than overshoot gradually when adjusting, it is very many that the number of times that repeats to try becomes, and the adjustment of gain expends time in.
Summary of the invention
The object of the present invention is to provide a kind of can be according to mechanical property and punching press condition etc., easily and the method for changing force control gain and the apparatus for controlling die cushion that correctly carry out the change of force control gain.
To achieve these goals, a mode of method for changing force control gain of the present invention is carried out in the control circuit of power control at the die cushion that the slide block by servomotor pair and press disposes in opposite directions, be used to change the force control gain of representing as the power deviation and the ratio of speed value, be characterized as and have following steps: thus the poor of described amount of movement between the two under the state that the power that is subjected to mutually between the two takes place to collide described slide block and described die cushion obtained; Power when producing described amount of movement poor detects; When the structure division that will comprise described slide block and described die cushion is considered as elastic construction, calculate the spring constant of this structure division according to certain proportionate relationship of between the power of the difference of described amount of movement and described reality, setting up; And, change described force control gain according to described spring constant by certain proportionate relationship of between the inverse of described force control gain and described spring constant, setting up.
The die cushion that one form of apparatus for controlling die cushion of the present invention disposes in opposite directions for the slide block by servomotor pair and press carries out power and controls, be characterized as and have following each one: the amount of movement obtaining section, it obtains the poor of described amount of movement between the two in the state that thereby the power that is subjected to mutually between the two takes place to collide described slide block and described die cushion, wherein, the described power of the power test section on the described die cushion when having produced described amount of movement poor detects; The spring constant calculating part when the structure division that will comprise described slide block and described die cushion is considered as elastic construction, calculates the spring constant of this structure division according to certain proportionate relationship of setting up between the difference of described amount of movement and described power; And the force control gain changing unit, by certain proportionate relationship of between the inverse of force control gain of representing as the ratio of power deviation and speed value and spring constant, setting up, change described force control gain according to the described spring constant that calculates.
According to the present invention, when the structure division that will comprise slide block and die cushion is considered as elastic construction, because between the power of detected reality between slide block and the die cushion, have certain proportionate relationship the poor of the amount of movement of slide block and die cushion and when producing this amount of movement poor, so, can calculate the spring constant of the structure division that comprises slide block and die cushion thus with poor divided by the amount of movement between slide block and the die cushion of the power of detected reality between slide block and the die cushion.In addition, between the force control gain in spring constant that calculates and power control circuit, certain inversely prroportional relationship is set up, so multiply each other by inverse and the proportionality constant with spring constant, can obtain force control gain.
Like this, can be easily and correctly carry out the change of the force control gain corresponding with the variation of mechanical property, the change of punching press condition etc., responsiveness that can the control of raising power, the reliability of power control.In addition, by using best force control gain, can carry out the punch process of 3 accurate more dimension shapes.
Description of drawings
By the explanation of the following preferred forms that is associated with accompanying drawing, above-mentioned and other purpose, feature and the advantage of the present invention becomes clearer and more definite.In this accompanying drawing,
Fig. 1 is the structure chart of an embodiment of expression apparatus for controlling die cushion of the present invention.
Fig. 2 is the structure chart of the apparatus for controlling die cushion shown in Figure 1 of expression in detail.
Fig. 3 is the synoptic diagram of the slide block of expression stamping machine and the die cushion that disposes in opposite directions with this slide block.
Fig. 4 collides state afterwards to slide block and die cushion respectively, and has passed through the key diagram that the state after the stipulated time compares after colliding.
Fig. 5 is the block diagram of the control flow of expression apparatus for controlling die cushion shown in Figure 1.
Fig. 6 represents the part of the basic procedure that the computational methods to force control gain describe.
Fig. 7 represents the flow process of Fig. 6 has been appended the step flow process afterwards of obtaining speed value.
Fig. 8 represents flow process shown in Figure 7 has been appended the step flow process afterwards that the time after colliding is counted.
Fig. 9 is illustrated in and has appended the step flow process afterwards of judging the step of current instruction value and obtaining current instruction value in the flow process shown in Figure 8.
The specific embodiment
Below, use accompanying drawing that the object lesson of embodiment of the present invention is described in detail.Fig. 1 represents an embodiment of apparatus for controlling die cushion of the present invention.The apparatus for controlling die cushion of present embodiment is the apparatus for controlling die cushion 1 that carries out power control by 14 pairs of die cushions of servomotor 13, described die cushion 13 moves relatively at the slide block 12 of press shown in Figure 3 (only illustrating a part) 11, and slide block 12 between stamping material 19 is produced the power of regulation.Slide block 12 is positioned at the upside of stamping machine 11, and not shown oil cylinder can be moved up and down as drive source.Die cushion 13 is positioned at the downside of stamping machine 11, can utilize servomotor 14 to move up and down via ball screw 15.When collision has taken place via stamping material 19 in slide block 12 and die cushion 13, between the two under the state of power effect, die cushion 13 relatively moves downwards with respect to slide block 12, and power is between the two adjusted minutely, and the plasticity that improves stamping material 19 flows.
The apparatus for controlling die cushion 1 of present embodiment is in the control circuit that the power between slide block 12 and the die cushion 13 is controlled, also have the variation of the mechanical property of corresponding stamping machine 11, the change of punching press condition etc., the force control gain of representing as the ratio of power deviation and speed value can be changed to the function of optimal value, possesses following each one as shown in Figure 1: amount of movement obtaining section 2, it is obtained slide block 12 and collides with die cushion 13, the amount of movement between the two under the state (with reference to Fig. 4) of pressure effect between the two poor; Spring constant calculating part 3, when it is considered as elastic construction at punching press functional structure part (structure division) 16 that will comprise slide block 12 and die cushion 13, calculate the spring constant of punching press functional structure part 16 according to certain proportionate relationship of between the difference of amount of movement and power, setting up; And force control gain changing unit 4, certain proportionate relationship of setting up between its inverse according to force control gain of representing as the ratio of power deviation and speed value and spring constant, the corresponding spring constant that calculates by spring constant calculating part 3, the change force control gain.
As shown in Figure 3, the impulsive force when die cushion 13 takes place to collide in order to relax slide block 12 and die cushion 13, portion has the hydraulic chamber 17 of the liquid of having enclosed authorized pressure within it.This hydraulic chamber 17 when slide block 12 has carried out collision with die cushion 13 with the power of regulation by elastic compression.In addition, the not shown metal parts that is called backing plate etc. that has the relative 18a of mould up and down, 18b and support bed die 18b between slide block 12 and die cushion 13, mould 18a, 18b and backing plate etc. are regarded as when slide block 12 and die cushion 13 take place to collide power generation elastic deformation according to the rules.Therefore, between slide block 12 and the die cushion 13 between the detected power, there is certain proportionate relationship when comprising the amount of movement of punching press functional structure part 16 between slide block 12 and die cushion 13 poor of slide block 12 and die cushion 13 and producing this amount of movement poor.Therefore, in spring constant calculating part 3,, can obtain the spring constant K of punching press functional structure part 16 thus with poor divided by the amount of movement between slide block 12 and the die cushion 13 of detected power between slide block 12 and the die cushion 13.That is, spring constant can show as K=(the poor M of power F/ amount of movement).
The difference of the amount of movement between slide block 12 and the die cushion 13 for example can be obtained by method shown in Figure 4.This method is not clipping between slide block 12 and the die cushion 13 under the state of laminal stamping material (Fig. 3) 19, the position below the slide block 12 when making the 18a of mould up and down, 18b between slide block 12 and the die cushion 13 take place to collide and the difference of the position below the die cushion 13 are made as A, after up and down mould 18a, 18b have taken place to collide between slide block 12 and die cushion 13 through position below the slide block 12 the during stipulated time and the difference of the position below the die cushion 13 be made as B, with the difference of A and B as amount of movement.The amount of movement of die cushion 13 is less relatively for the amount of movement of slide block 12.The difference of amount of movement is obtained as the total amount of the elastic displacement of the decrement of die cushion 13 self and the 18a of mould up and down, 18b etc. between slide block 12 and the die cushion 13.
In addition, can also replace utilizing the position of detecting slide blocks 12, die cushion 13 as the position detection part 24 of linear movement pick-up, the difference of the translational speed of the translational speed of slide block 12 and die cushion 13 is carried out time integral, obtain the poor of amount of movement.At this moment, detect the translational speed of slide block 12 by ram speed test section 23 shown in Figure 2, and can be according to the translational speed of calculating die cushion 13 by the speed test section 21 detected values of servomotor 14.
The power that produces between slide block 12 and die cushion 13 can in all sorts of ways and obtain, and for example has: use the method that is arranged on the power sensor on the die cushion 13; The torque value of the torque sensor that possesses according to servomotor 14 is inferred the method for the power that imposes on object; And infer method of power etc. according to the current value of servomotor 14.In the present embodiment, the power sensor that is arranged on the die cushion 13 is used as power test section 20.
Then, the relation about force control gain and spring constant can describe as follows.Force control gain is the ratio of power deviation and speed value.Promptly show as: power deviation * force control gain=speed value.When this formula is out of shape, can show as: force control gain=(speed value/power deviation)=(proportionality constant C/ spring constant K).
When the power deviation is made as e, when the spring constant of elastic construction is made as K,, elastic construction need be shortened L=e/K in order to obtain the power of inadequate e by the power command value.Thus, the power deviation is replaced into position deviation, and feeds back to the setting of the optimum gain of Position Control ring.Gain control position in the control loop of position is P[1/sec], when the pass of position deviation L and speed command V was V=P * L, V represented with time 1/P[sec] speed command of displacement L, optimum P becomes fixed value according to mechanical system.When to L substitution L=e/K, be V=(P/K) * e.The power gain of setting with parameter is P/K, in order to obtain optimum power gain, the value change power gain of corresponding K.So, between the spring constant and force control gain that are calculated by the spring constant calculating part, set up certain inversely prroportional relationship, the Comparative Examples constant C multiply by the inverse of spring constant K in the force control gain changing unit, can obtain force control gain thus.
Then, according to Fig. 2 apparatus for controlling die cushion 1 is illustrated in further detail.This apparatus for controlling die cushion 1 also has: not shown upper control part, and it carries out from the processing of the control signal of external equipment or carries out processing at the comprehensive control instruction of servomotor 14; Power control part 6, it is as according to the force data by power test section 20 detected reality the power command value of being set by upper control part being carried out feedback processing, the control circuit of output speed command value; Speed controlling portion 7, it is positioned at downstream one side of power control part 6, as the speed control circuit according to speed value output torque instruction value; And current control division 8, it is positioned at downstream one side of speed controlling portion 7, as torque instruction value is converted to current instruction value, and the current control circuit of servomotor 14 being controlled via not shown servo amplifier.Power control part 6, speed controlling portion 7 and current control division 8 have constituted digital servo circuit.
In addition, the external equipment as apparatus for controlling die cushion 1 has: power test section 20, to power control part 6 feedbacks detected force data between slide block 12 and die cushion 13; Feed back to the electromotor velocity test section 21 of the encoder of speed controlling portion 7 as rotary speed with detected servomotor 14; Current detecting part 22 is to the detection electric current of the detected servomotor 14 of current control division 8 feedbacks; Ram speed test section 23, it provides ram speed to amount of movement obtaining section 2; With as the position detection part 24 of displacement of the lines sensing that amount of movement obtaining section 2 is provided the position data of slide block 12 and die cushion 13.
Upper control part has CPU (central arithmetic processing apparatus), on CPU via bus connect the memory that constitutes by ROM, memory, the nonvolatile memory that constitutes by RAM, outside teaching operation dish, various interface, various memory with LCD.On interface, be electrically connected each test section 20～24 mutually, and be transmitted in detected data in each control part 6～8.
As shown in Figure 5, in power control part 6,, obtain the power deviation as the difference of power command value and power detected value multiply by the resulting value of force control gain as speed value G1.In addition, in power control part 6, when except proportional action, also using the integral action of integrator 25, can be used as speed value=power deviation * power gain G 1+ ∑ (power deviation * power gain G 2) and obtain.In addition, power gain G 1 and power gain G 2 relation that can be used as the regulation multiplying power is obtained.
In speed controlling portion 7, the velocity deviation of obtaining the difference of the speed value obtained as power control part 6 and speed detected value as torque instruction value multiply by the resulting value of speed ride gain G3.In addition, in this speed controlling portion 7, when except proportional action, also using the integral action of integrator 26, can be used as torque instruction value=velocity deviation * speed gain G3+ ∑ (power deviation * power gain G 4) and obtain.
Then, adopt Fig. 6～9 pair to use the method for changing force control gain of the apparatus for controlling die cushion 1 of present embodiment to describe.In addition, in Fig. 6～9, shared operation is marked identical step number.
Fig. 6 has represented the part of the most basic method for changing force control gain.In step 1, the slide block 12 and the difference of the amount of movement of die cushion 13 can be obtained as the difference of slide position that is measured to by position detection part 24 and die cushion position.In addition, as other method, the time integral that can be used as the difference of ram speed and die cushion speed is obtained.In step S2, obtain from the force data that is arranged on the power test section 20 on the die cushion 13.At step S3, obtain detected force data divided by the value of slide block 12 with the difference of the amount of movement of die cushion 13 as spring constant.In step S4, will obtain force control gain thus as the proportionality constant of the physical quantity under the optimum control state of punching press functional structure part divided by the spring constant of in step S3, obtaining.
Fig. 7 is illustrated in the method for having appended other step in the flow process shown in Figure 6, and expression begins to the control flow of formation speed instruction from the change of gain.At step S01, judge by collision test section not shown among Fig. 2 whether slide block 12 and die cushion 13 collision has taken place, and enters step S1 when collision has taken place, when not taking place to collide, enter step S7, carry out Position Control.By this Position Control, slide block 12 and die cushion 13 are positioned at arbitrarily on the position at high speed.On the other hand, when in step S1～S4, having changed force control gain, basis force control gain formation speed command value after changing in step S5.And, in step S6, control servomotor 14 according to the speed value that is generated.
Fig. 8 represents in order to judge after slide block 12 and die cushion 13 have taken place to collide whether passed through official hour, appended other method of the step etc. of cumulative time.After having judged in step S01 whether slide block and die cushion have taken place to collide, when being judged as when collision has taken place, S02 calculates the elapsed time in accumulator in step.On the other hand, when in step S01, being judged as generation collision, accumulator is carried out zero clearing, enter step S7 at step S03.Judge elapsed time of calculating among the step S04 after step S02 whether in official hour,, enter step S1～S4 when being in the stipulated time time with accumulator.When not being enters step S8 in the stipulated time time, do not remain to gain so far with not changing ride gain.It is identical with Fig. 7 with step S6 to be connected on step S1～S4, step S8 step S5 afterwards respectively, so the repetitive description thereof will be omitted.
Fig. 9 has represented to append current value other method of the step of saturated (fixed value) whether of judging servomotor 14.Judge in step SS01 whether current value is saturated, when saturated, be identified as the state that is in after slide block 12 has just taken place to collide with die cushion 13, enter step S1～S4.On the other hand, not having to enter step SS7 when saturated, remain to force control gain so far.After step S1～S4, step SS7, in step S5, ask speed value respectively, in step SS6, obtain current instruction value, then, in step SS8, carry out control based on the servomotor 14 of current instruction value according to velocity deviation.In addition, represented that in the method saturated state of current instruction value and current instruction value are the identical state of state meaning of fixed value, collide by slide block 12 and die cushion 13, die cushion 13 moves down with full torque (full torque).Under this state, can be easily and correctly obtain force control gain by the change force control gain.
So, according to present embodiment, can be easily and correctly carry out the change of the force control gain corresponding with the variation of mechanical property, the change of punching press condition etc., responsiveness that can the control of raising power, the reliability of power control.In addition,, can improve the plastic fluidity of stamping material, prevent from stamping material 19, to produce wrinkle or punching press crackle, carry out 3 dimension shape punch process of the complexity that all the time can't carry out high-qualityly by using optimum force control gain as required.
In addition, the invention is not restricted to above-mentioned embodiment, can carry out various changes and enforcement.The power test section 20 that power between slide block 12 and the die cushion 13 is detected is arranged on the die cushion 13 in the present embodiment, but also can be arranged on the slide block 12, so can improve the precision of the spring constant that is calculated, and then can correctly obtain force control gain.
Claims (6)
1. method for changing force control gain, be used for carrying out the control circuit of power control at the die cushion (13) that the slide block (12) with press (11) is disposed in opposite directions by servomotor (14), the force control gain that change is represented as the power deviation (e) and the ratio of speed value, it is characterized in that having following steps:
Obtain described slide block (12) and described die cushion (13) thus poor (M) of the described amount of movement between the two under the state that is subjected to power (F) between the two mutually takes place to collide;
Described power (F) when having produced poor (M) of described amount of movement detects;
When the structure division that will comprise described slide block (12) and described die cushion (13) is considered as elastic construction, calculate the spring constant (K) of this structure division according to certain proportionate relationship of between poor (M) of described amount of movement and described power (F), setting up; With
By certain proportionate relationship of setting up between the inverse of described force control gain and described spring constant (K), (K) changes described force control gain according to described spring constant.
2. an apparatus for controlling die cushion (1), the die cushion (13) that the slide block (12) with press (11) is disposed in opposite directions by servomotor (14) carries out power control, it is characterized in that having:
Amount of movement obtaining section (2), it is obtained described slide block (12) and described die cushion (13) thereby poor (M) of the described amount of movement between the two in the state that is subjected to power (F) between the two mutually takes place to collide, wherein, the described power (F) of the power test section (20) on the described die cushion (13) when having produced poor (M) of described amount of movement detects;
Spring constant calculating part (3), when the structure division that will comprise described slide block (12) and described die cushion (13) is considered as elastic construction, calculate the spring constant (K) of this structure division according to certain proportionate relationship of between poor (M) of described amount of movement and described power (F), setting up; And
Force control gain changing unit (4), by certain proportionate relationship of between the inverse of force control gain of representing as the ratio of power deviation (e) and speed value and described spring constant (K), setting up, change described force control gain according to the described spring constant (K) of calculating.
3. apparatus for controlling die cushion according to claim 2 (1) is characterized in that,
Described force control gain changing unit (4) changes described force control gain by the reciprocal multiplication of proportionality constant with the described spring constant (K) that is calculated by described spring constant calculating part (3) of the regulation that will obtain under the Optimal Control state of described die cushion (13).
4. apparatus for controlling die cushion according to claim 3 (1) is characterized in that,
Described amount of movement obtaining section (2) is carried out integration by the difference to the translational speed of the translational speed of the described die cushion (13) obtained by the rotary speed of described servomotor (14) and described slide block (12), obtains poor (M) of described amount of movement.
5. apparatus for controlling die cushion according to claim 3 (1) is characterized in that,
In stipulated time after described slide block (12) and described die cushion (13) take place to collide, (K) changes described force control gain according to described spring constant.
6. apparatus for controlling die cushion according to claim 3 (1) is characterized in that,
At the current instruction value at described servomotor (14) is in the stipulated time of fixed value, changes described force control gain.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006254692 | 2006-09-20 | ||
| JP2006-254692 | 2006-09-20 | ||
| JP2006254692A JP4185128B2 (en) | 2006-09-20 | 2006-09-20 | Force control gain changing method and die cushion control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101147939A CN101147939A (en) | 2008-03-26 |
| CN101147939B true CN101147939B (en) | 2010-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101534576A Expired - Fee Related CN101147939B (en) | 2006-09-20 | 2007-09-19 | Method for changing force control gain and die cushion control apparatus |
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| Country | Link |
|---|---|
| US (1) | US7757526B2 (en) |
| EP (1) | EP1902793B1 (en) |
| JP (1) | JP4185128B2 (en) |
| CN (1) | CN101147939B (en) |
| DE (1) | DE602007003286D1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101937203A (en) * | 2010-04-28 | 2011-01-05 | 上海洋航机电设备有限公司 | Force and displacement monitoring device and method for controlling press mounting assembly by utilizing same |
| KR101343257B1 (en) * | 2010-05-18 | 2013-12-18 | 미쓰비시덴키 가부시키가이샤 | Motor control apparatus |
| CN102959856B (en) * | 2010-07-14 | 2015-09-02 | 三菱电机株式会社 | Controller for motor |
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- 2007-09-19 US US11/857,620 patent/US7757526B2/en active Active
- 2007-09-19 EP EP07018419A patent/EP1902793B1/en not_active Ceased
- 2007-09-19 CN CN2007101534576A patent/CN101147939B/en not_active Expired - Fee Related
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| US6205863B1 (en) * | 1997-08-13 | 2001-03-27 | Japan Tobacco Inc. | Material testing machine having a control system for feedback-controlling the operation of a servo system |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2008073713A (en) | 2008-04-03 |
| CN101147939A (en) | 2008-03-26 |
| DE602007003286D1 (en) | 2009-12-31 |
| EP1902793A3 (en) | 2008-09-17 |
| EP1902793B1 (en) | 2009-11-18 |
| JP4185128B2 (en) | 2008-11-26 |
| US7757526B2 (en) | 2010-07-20 |
| EP1902793A2 (en) | 2008-03-26 |
| US20080066515A1 (en) | 2008-03-20 |
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